Amazon Bedrock Generators: Update model list

[bilgeyucel]

Is your feature request related to a problem? Please describe.
amazon.nova-*, deepseek.r1-v1:0, ai21.jamba-1-5-* models are not supported by AmazonBedrockGenerator and raise this error:

Could not auto-detect model family of amazon.nova-lite-v1:0. model_family parameter must be one of ('amazon.titan-text', 'ai21.j2', 'cohere.command', 'cohere.command-r', 'anthropic.claude', 'meta.llama', 'mistral').

The Could not auto-detect model family error doesn't show up with AmazonBedrockChatGenerator. Bypassing this error seems like a bug for AmazonBedrockChatGenerator, as this might mean that we don't check the model family (maybe it's not required, idk)

Describe the solution you'd like

• Add missing model prefixes to the model_family and remove the old ai21.j2.
• Add model family check to AmazonBedrockChatGenerator for consistency

Describe alternatives you've considered
N/A

Additional context
Notebook to test model supports https://colab.research.google.com/drive/1t2TYbc75uP4LJbcqKXX2KHR98hW4TuLf?usp=sharing

Once these models are added to the integration, we should update the integration page content here and the related documentation pages, especially the parts about "Supported models".

[julian-risch]

Let's explore if we even need to check model family in the ChatGenerator

[julian-risch]

update the integration page and if there any occurrences of Generator see if we can replace with ChatGenerator

[bilgeyucel]

Integration page is updated in this PR: deepset-ai/haystack-integrations#322